Improvement in steam-engine globe-valves



@einen tetra @anni @ifica- JOHN 13. LOWELL, oF BALTIMORE, MARYLAND.

Laar@ Pam No. 'zacsa'aafaz member 24, 1867. t

IMPROVEMENT IN STEAM-ENGINE GLOBE-VALVES.

TO ALL WHOM IT MAY GONCERN:

Be it known that I, JOHN BURNETT LOWELL, of Baltimore, inthe county of lx3altimore, and State of Mary-A land, have invented a new and improved Globe-Valve; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specificati/on, and in which- I t l Figure 1 is a longitudinal section of' a globe-valve, showing a vertical section of my invention in conncctior therewith. I n

FigureZ is a vertical cross-section through the same.

' Figure 3 is a top view ofthe valve, with the hand-wheel removed.

Figure 4 is a perspective view .ofv the hand-wheel upside down. I

Similar letters Vof reference indicate corresponding parts in the several figures,

In this invention a new device is employed for grinding the valveto its seat without removing the valve.'

vIn the drawings, A representen pipeexpanded into a globular chamber at A', in which is provided a stout partition, a, separatingthe globular chamber intotwo compartments, one communicating with oneendof the pipe A, and the other' with the other end. The partition is constructed in the form shown in iig. 1, in order to a'ord a. valve-seat, a', which shall accommodate a valve working at right angles with the main pipe A. This valve is an ordinary circular plug-valve, shown at c, seating downward upon the valve-seat a. The valve C extends through the walls of the chamber A', and works in a sleeve, e, which screws up and down through the l'substantially in the manner and for the purpose specified.

wall of the chamber, by means of the threads'z'z' z'. When the sleeve isiscrewed down, it presses upon the valve e, and seats it. When unscrcwedLit releases'the valye, which'will then open-by`any pressure from beneath. That part ofthe valveste'm enclosed within the sleeveris cylindrical in form. Above the sleeve, from the point :n to the point a, or the top of" thestem, it is, square or polygonal.l Both the sleeve and the valve-stem are worked by means of a hand-wheel, w, which is provided on one side with a central clutch, a', that operates upon the sleeve when the wheel is placedwith that side down, as shown in iig. 1, turning the sleeve in either direction, and screwing 'it down or up as the case may be. When the sides of the wheel are reversed, as shown in fig. 2, the clutch projecting upward and the fiat side of the wheel. downward, the wheel does not 'operate upon the sleeve' at all/but only on the'valve-stem, which being square or polygonal at that point, enters a square or polygonal aperture or socket, provided at the centre of the wheel for the purpose, and is held there rmly, and turned in either direction with the wheel. The square or polygonal socket does not extend entirely through the wheel, but only on one side ofit, so that the whccl operates as a wrench upon the valve-stem only when placed with that side down. When placed with thatside up, the square part of the valve-stem does not quite reach up to the square soclet ofthe wheel, and it accordingly leaves the valve-stem free while the force of the lwheel is exerted upon the sleeve e. by means ofthe clutch.

By this arrangement the hand-wheel can be used for seating or opening the valve, or, by simply turning upside down, it may be used for turning the valve alone, with any required degree of force, for the purpose of grinding the valve to its seat. Thiaanay be done, it is evident, without removing the valve or interfering with the parts inany way, except simply to reverse the position of the hand-wheel.

As the valve will need grinding only once in a great while, the ordinary position of the several parts of the device will bc that shown in tig. 1'. When in this position, the aperture through the centre of the hand-wheel may be closed, and lthewheel conned'in its place by means of a button, I, fixedl to a screw-stem, which passes throtigh the aperture and screws into the top ofthe valve-stem, as shown at o. D is an opening, through which emery may be introduced to assist in grinding the valve. E is another opening, through which light can he admitted to the valve-seat during the grinding, and the progress of the work be inspected. Both openings may bc closed by a; screw-plug at all other times. i v Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is'- Thc combination of the hand-wheel, constructed with the'clutch 'v and the square opening, as `described, with the sleeve e and valve-stem C, the latter being constructed as set forth, and all the parts operating together,

Jouir B. LOWELL.,

Witnesses:

Giras.V A. PETTIT, SoLoN-O. Kanon. 

